MEDIUM Sudoku Puzzles M71-M80

Medium Sudoku Puzzle M71
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Medium Sudoku Puzzle M72
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Medium Sudoku Puzzle M73
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Medium Sudoku Puzzle M74
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Medium Sudoku Puzzle M75
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Medium Sudoku Puzzle M76
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Medium Sudoku Puzzle M77
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Medium Sudoku Puzzle M78
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Medium Sudoku Puzzle M79
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Medium Sudoku Puzzle M80
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Solutions for above 10 Medium sudoku puzzles M71 to M80 can be found Here.

Objective:

Fill in the 9×9 grid so that each row, column, and 3×3 subgrid contains all of the numbers from 1 to 9, without any repetition.

Rules:

Each row must contain all the numbers from 1 to 9 without repetition.
Each column must contain all the numbers from 1 to 9 without repetition.
Each 3×3 subgrid (box) must contain all the numbers from 1 to 9 without repetition.